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  4. 1.5 mol of O2 combines with Mg to form oxide MgO. The mass of Mg (at. mass 24) that has combined is

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Q. $1.5$ mol of $O_2$ combines with $Mg$ to form oxide $ MgO$. The mass of $Mg$ (at. mass $24$) that has combined is

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Solution:

$\underset{1\,mole}{Mg} + \underset{0.5\,mole}{\frac{1}{2} O_2} \to MgO$
$0.5$ mole of oxygen react with $1$ mole of $Mg$
$1.5$ mole of oxygen react with $\frac{1.5}{0.5} = 3$ mole
$24\times 3 = 72\,g$.